Grinding-machine.



No. 67I,256. "Patented Apr. 2, I90L l A. WHITNEY.

GRINDING MACHINE.

Application filed Dec. 14, 1900.` (no Modem 2 sheets* sheet l.

No. 671,256. Patented Aprjz, 190|.

A. WHITNEY.

GRINDING MAcHlNE; rAppnc'acian ma nec. 14, 1900..

(No Medel.)

`iivTTnn STATES PATENT FFICE.

ALFRED WHITNEY, OF PHILADELPHIA, PENNSYLVANIA.

GRINDING-IVIACHINE.

SPECIFICATION' forming part ofLetter-s Patent N o. 671,256, dated April 2, 1901.

Application tiled December 14, 1900. Serial No. 39,883- LNo model.)

To f//Z 1077/0717, t may con/cern;

Be it known that LALFRED WH1TNEY,a citizen of the United States, residing in Philadelphia, Pennsylvania,haveinvented certain Improvements in Grinding-Machines, of which the following is a specification.

My invention relates to certain improvements in machines for grinding knives for use in connection with barrel-stave-making machines and machines of a similar type, and more particularly to improvements in the operating mechanism and in the grinding-head of such machines.

It has for one object the provision of means for accurately adjusting the grinding-head of a knife-grinding machine, by which knives may be ground to a radius equal to or greater than that of the grindstone used, a further object being the provision of an improved device for firmly holding a knife in the grinding-head, together with other improvements hereinafter set forth.

In the accompanying drawings,Figure l is a plan view of one form of myimproved machine. Fig.2isatransverse sectional view ofthesame, taken on the line 2 2, Fig. 1, and showing the means for adjusting and governing the amount of motion given to the grinding-head. Fig. 3 is a longitudinal sectional view of the grinding-head, taken on the line 3 3, Fig. 2. Fig. I is a sectional plan view of the same, taken on the line 4 4, Fig. 3. view of the grinding-head. Fig. 6 is a view of the guides on the end sections of the carriage, showing their relation to the slides for the cutter-head; and Fig. 7 is'a view ofa modiication of the construction of the eccentricshaft in the cutter-head.

In the drawings, B isa grindstone keyed to a shaft, which runs in bearings b b and is operated from any convenient source of power.

A is the base-plate orr casting of the machine, having on it a vertical guide-rail a and a number of track-like surfaces d a'.

C is a carriage mounted in rollers c c, which traverse the surfaces d d', and is guided by rollers c, which travel in contact with the guide-rail d. These rollers are provided with shafts and are supported in suitable bearings o'n the carriage C, one set of rollers being earried by the arms c2 and operating against the back of the guide-rail a. Other rolls are car- Fig. 5 is an end ried by the frame and bear against the inside of the rail a, so as to resist the pressure while the knife is being ground.

From Figs. l and 2 it will be seen that the shaft d, by which the grinding-head is moved toward or from the grindstone, is supported in bearings c3 and also in a bearing in the frame of the carriage, and on this shaft is a hand-wheel e and a gear-wheel e', this latter wheel meshing with a gear-wheel e2 on a longitudinal shaft d', mounted in bearings c4. This shaft has at each end a bevel gear-wheel c3, and each of these wheels mesh with bevelgears e4 c4 on transverse shafts d2, mounted in bearings c5( These shafts are threaded, as

shown, and entend through threaded openings in the lugs f2 on slides f. There are preferably set-screws e5 by which vthe gearwheels e4 a?ield to the shafts d2. These are provided i order that one end of the grinding-head ,hereinafter described, may be moved toward or from the grindstone independently of the other end. Small `hand-wheels (Z3 are secured to the shafts d2, so that either shaft can be turned independently of the other, the set-screw e5 on one of the gear-Wheels e4 being first slacked off to free it from the shaft d2.

Guides ff are fastened to the inside of the end sections of the carriage C, supportingbetween them the slidesff', as shown in Fig. 6. Each slide has a recess or bearing for the reception of the trunnions g g of a grindinghead G. The head G consists of a frame having one side concaved and the other side convexed for the reception of a curved knife m to be ground. The frame is open at the top and bottom, being preferably constructed as shown in Figs. 3, 4, and 5 and having the trunnion-pieces g g screwed into the ends. The sides are joined midway between the ends by a web-piece g and have slots g2 for the accommodation of the clamping member h. It will be understood that I may, if desired, run these slots out to the end of the cutter-head, having the trunnion cast solid on one end and screwed in place on the other. The clamping member his U-shaped in form, having clamping-arms h' h/ and a slot through its center for the eccentric-rod il. At one end of this rod is a circular head fi', on which is a supporting projection 2, the other end of said rod extending through an opening in the web-piece g and being guided therby. The clamping member h is adjustable on the rod t', and there is a pin h2, by which it may be connected to the rod, the rod having a series of holes 113 through it for this purpose. A shaftj, having retaining-collars] and squared ends, is journaled in the sides of the head and has on it an eccentric j2, constructed to operate in an opening in the head i', giving longitudinal motion tothe rod and to the attached clamping member h when the shaft is rotated.

If desired, the shaft]` may be turned larger in diameter inside the head than it is at its bearings in the sides of the same, the necessity of the collars j being thereby dispensed with. Vhen this construction is used, an opening is made in the side of the frame and a piece is fitted to this opening having in it one of the shaft-bearings, so as to allow of the insertion of the shaft, as plainly shown in Fig. 7. A set-screw g5 is mounted in each bearing of the shaft j, so that the shaft, and hence the clamping mechanism, may be secured after adjustment.

There are projecting edges g3 g3 running along diametrically opposite corners of the grinding-head for supporting the knives and similar edges g4 g4 on the end remote from the clamping mechanism against which the knives are clamped.

A standard or guide la, preferably of the construction shown, is bolted to .the carriage O, its upper part being slotted and having on one side adjustable stops lo 7c. An operating-lever l is bolted to the grinding-head, fitting in either one of the recesses Z' Z in the same, and has a slotted end which is movable vertically between the stops lo k. This lever has a handle k2, and it is secured to the standard by means of the clamp k3.

In operation a knife 'm to be ground is placed on the projecting edge g3 of the grinding-head, and the clamping member h is moved until the hole through it corresponds to the hole nearest to the position at which its lug h will engage the knife, the eccentric j?, which is keyed to the shaft, being in the position shown in Fig. 4E. The pin h2 is now inserted in the two holes, connecting the piece h with the rod 11, and with a suitable wrench the shaftj is rotated until the eccentric L72 has moved the piece h by means of the rod far enough to engage and clamp the knife between its lug h and the edge g4 of the head G.

The stops t' k are set at predetermined points on the standard, allowing a definite amount of motion of the operating-lever Z,this corresponding to a known amplitude of rotation of the grinding-head on its trunnions g g. By means of the hand -wheel e the grinding-head is now moved outwardly from the carriage, and by moving the handle up and down while bringing the knife m in contact with the surface of the rapidly-rotating grindstone a curve of any desired radius may be given to the said knife.

Should it be wished to grind the knife to a radius equal to that of the grindstone, the lever l is clamped to the standard in a midposition and the grindinghead moved inwardly, bringing and keeping the knife fairly against the stone.

It will be noted that a knife may be held with equal facility either on the concave or on the convex side of the head G, it thus being possible to grind its front as well as its back face.

I claim as my invention l. The combination in a knife-grinding machine, of a grindstone, a carriage, means for retaining said carriage at a fixed distance from the surface of the grindstone, while allowing it to move parallel to said surface, means on the carriage for holding a knife to be ground, and means for operating the same said means including a device for limiting the movement of said holding means whereby the knife may be ground to a certain definite curve equal to or greater than the radius of the grindstone, substantially as described.

2. The combination of a grindstone, a carriage,agrindinghead on said carriage, means on said head for supporting a knife to be ground, a guide on the carriage and a lever attached to the grinding-head and operating on the said guide whereby rotary motion may be given to the said head, substantially as described.

3. The combination of a grindstone, a base, a carriage movable on said base, a grindinghead capable of rotary motion and supported on the said carriage, a lever attached thereto, a guide supported on the carriage, having on it adjustable stops, the said lever being operative on the guides between the said stops, substantially as described.

e. The combination of a grindstone, a baseplate, a carriage thereon movable parallel to the Working face of the grindstone, While being prevented from approaching thereto,mov able bearings on the carriage, agrinding-head on the carriage having trunnions constructed to fit said bearings, means on the carriage for moving the said head toward and from the grindstone relatively to the carriage and means for swinging the head on its trunnions, substantially as described.

5. The combination of a grindstone, a baseplate, a carriage thereon, movable bearings on the carriage, a grinding-head having trunnions constructed to fit said bearings, with means on the carriage for moving said head as a whole toward and from the grindstone and means for moving one end of the head toward or from the grindstone, independently of the other end, substantially as described.

6. The combination of a grindstone, a baseplate, a carriage thereon, movable slides on the carriage having bearings in them, screws entering the slides, means for operating the same whereby motion is given to the slides, agrinding-head having trunnions adapted to the bearings in the slides, means on the said IOO IIO

grinding-head for clamping a knife thereto, and means on the carriage for giving a definite amount of rotary motion to said grinding-head, substantially as described.

7. The combination in a knife-grinding mechanism, of a grindstone, a carriage, a grinding-head thereon, said grinding-head consisting of a hollow frame, and clamping mechanism therein comprising a device adjustable for holding knives of varying lengths and mechanism for clamping the knife after the said device has been adjusted to thelength thereof, substantially as described.

8. In a grinding-head for a grinding-ma chine of the character described, the combination of a frame having trunnions, a bar in said frame, a clamping member adjustable thereon, and mechanism connected to the bar capable of giving to it a relatively small amount of motion whereby a knife may be clamped after the said clamping member has been adjusted, substantially as described.

9. In a head for a knife-grinding machine of the character described, the combination of a hollow frame, a slot therein, a clam ping member in the said frame and projecting through the slot, a bar on which said clamping member is adjustable, a head to the bar andan eccentric operative in said head, where by the bar may be given a relatively small longitudinal motion when it is desired to clampa knife, substantially as described.

l0. In a head for aknife-grinding machine of the character described, the combination of a frame, knife supporting and holding projections thereon, slots in the frame, a clamping member projecting through said slots, a headed bar having holes through it, a hole in the clamping member and a pin for holding the saine to the bar, a shaft in the frame and an eccentric on the said shaft adapted to an opening in the head of the bar, substantially as described.

1I. A head for a knife-grinding machine of the character described, consisting of a hollow frame having trunnions, one side of said frame being concave and the other side being convex, with means for holdinga knife to be ground on either-side of the frame, and means for clamping the knife thereto, substantiallj1 as described.

l2. In a grinding-machine of the character described, a reversible grinding-head having -one side convex and another concave, with means for holding a knife to be ground on either side, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ALFRED WHITNEY.

Witnesses:

WILLIAM E. BRADLEY, Jos. H. KLEIN. 

